Article Title

Bis(phthalocyaninato)yttrium grown on Au(111): Electronic structure of a single molecule and the stability of two-dimensional films investigated by scanning tunneling microscopy/spectroscopy at 4.8 K

Authors

Yanfeng Zhang, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-0877, Japan Center for Nanochemistry, Academy for Advanced Interdisciplinary Studies, Department of Advanced Materials and Nanotechnology, College of Engineering, Beijing University, Beijing 100871, China
Pengfei Guan, WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Hironari Isshiki, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-0877, Japan Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
Mingwei Chen, WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Masahiro Yamashita, Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
Tadahiro Komeda, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-0877, Japan CREST, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan

Keywords

Scanning tunneling microscopy/spectroscopy (STM/STS), phthalocyanine, electronic structure

Abstract

Scanning tunneling microscopy/spectroscopy (STM/STS) at 4.8 K has been used to examine the growth of a double-decker bis(phthalocyaninato)yttrium (YPc2) molecule on a reconstructed Au(111) substrate. Local differential conductance spectra (dI/dV) of a single YPc2 molecule allow the characteristics of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) to be identified. Furthermore, lateral distributions of the local density of states (LDOS) have also been obtained by dI/dV mapping and confirmed by first principles simulations. These electronic feature mappings and theoretical calculations provide a basis for understanding the unique STM morphology of YPc2, which is usually imaged as an eight-lobed structure. In addition, we demonstrate that bias-dependent STM morphologies and simultaneous dI/dV maps can provide a way of understanding the stability of two-dimensional YPc2 films.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-010-0021-9

Publisher

Tsinghua University Press

Recommended Citation

Yanfeng Zhang,Pengfei Guan,Hironari Isshiki,Mingwei Chen,Masahiro Yamashita,Tadahiro Komeda, Bis(phthalocyaninato)yttrium grown on Au(111): Electronic structure of a single molecule and the stability of two-dimensional films investigated by scanning tunneling microscopy/spectroscopy at 4.8 K. NanoRes.2010, 3: 604–611